/**
 * Copyright (C) 2010 altuure <altuure [AT] gmail [DOT] com> http://www.altuure.com/projects/yagdao
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.altuure.yagdao.jpa;

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;

/**
 * TODO make thread safe
 * @author makkan
 */
public class DefaultEntityManagerAccessor implements EntityManagerAccessor {
    private static final ThreadLocal<EntityManager> LOCAL = new ThreadLocal<EntityManager>();
    private EntityManagerFactory entityManagerFactory;

    public DefaultEntityManagerAccessor(EntityManagerFactory entityManagerFactory) {
        this.entityManagerFactory = entityManagerFactory;
    }

    public EntityManager getEntityManager() {
        EntityManager entityManager = LOCAL.get();
        if (entityManager == null) {
            entityManager = entityManagerFactory.createEntityManager();
            LOCAL.set(entityManager);
        }
        return entityManager;
    }

    public void clear() {
        LOCAL.remove();
    }
}
